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    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
    <title>第十一课 引用类型（单体内置对象）</title>
</head> 
<body>
    <script>
        // console.log(Global);
        // console.log(window);
        // console.log(NaN);
        // var url = 'http://www.xingxingclassroom.com/index/课程列表';
        // console.log(encodeURI(url));
        // console.log(encodeURIComponent(url));
        // var url1 = 'http://www.xingxingclassroom.com/index/%E8%AF%BE%E7%A8%8B%E5%88%97%E8%A1%A8';
        // console.log(decodeURI(url1));
        // console.log(decodeURIComponent(url1));
        // eval('alert(123)');
        // alert(123);
        // console.log(1 + 2);
        // var date1 = new Date();
        // console.log(Math.PI);//3.141592653589793
        // var num = -100;
        // var num1 = 113.136;
        // // console.log(Math.abs(num));
        // console.log(Math.ceil(num1));
        // console.log(Math.floor(num1));
        console.log(Math.round(200.669));
    </script>
</body> 
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